igneous rock « Back to Glossary IndexRocks that are formed from liquid rock, i.e. from volcanic processes. Synonyms: igneous, igneous rocksRelated Articles: 1 Understanding ScienceGlossary: porphyriticGlossary: amphiboleGlossary: migmatiteGlossary: carbonatite« Back to Glossary Index Author: Chris Associate Professor, Salt Lake Community College, Salt Lake City, Utah View all posts by Chris